The Tor Browser: security/nss/lib/freebl/mpi/tests/mptest-3a.c@b8a032363ba2

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

     1 /*

     2  * Simple test driver for MPI library

     3  *

     4  * Test 3a: Multiplication vs. squaring timing test

     5  *

     6  * This Source Code Form is subject to the terms of the Mozilla Public

     7  * License, v. 2.0. If a copy of the MPL was not distributed with this

     8  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

    10 #include <stdio.h>

    11 #include <stdlib.h>

    12 #include <string.h>

    13 #include <ctype.h>

    14 #include <limits.h>

    16 #include <time.h>

    18 #include "mpi.h"

    19 #include "mpprime.h"

    21 int main(int argc, char *argv[])

    22 {

    23   int        ix, num, prec = 8;

    24   double     d1, d2;

    25   clock_t    start, finish;

    26   time_t     seed;

    27   mp_int     a, c, d;

    29   seed = time(NULL);

    31   if(argc < 2) {

    32     fprintf(stderr, "Usage: %s <num-tests> [<precision>]\n", argv[0]);

    33     return 1;

    34   }

    36   if((num = atoi(argv[1])) < 0)

    37     num = -num;

    39   if(!num) {

    40     fprintf(stderr, "%s: must perform at least 1 test\n", argv[0]);

    41     return 1;

    42   }

    44   if(argc > 2) {

    45     if((prec = atoi(argv[2])) <= 0)

    46       prec = 8;

    47     else

    48       prec = (prec + (DIGIT_BIT - 1)) / DIGIT_BIT;

    49   }

    51   printf("Test 3a: Multiplication vs squaring timing test\n"

    52 	 "Precision:  %d digits (%u bits)\n"

    53 	 "# of tests: %d\n\n", prec, prec * DIGIT_BIT, num);

    55   mp_init_size(&a, prec);

    57   mp_init(&c); mp_init(&d);

    59   printf("Verifying accuracy ... \n");

    60   srand((unsigned int)seed);

    61   for(ix = 0; ix < num; ix++) {

    62     mpp_random_size(&a, prec);

    63     mp_mul(&a, &a, &c);

    64     mp_sqr(&a, &d);

    66     if(mp_cmp(&c, &d) != 0) {

    67       printf("Error!  Results not accurate:\n");

    68       printf("a = "); mp_print(&a, stdout); fputc('\n', stdout);

    69       printf("c = "); mp_print(&c, stdout); fputc('\n', stdout);

    70       printf("d = "); mp_print(&d, stdout); fputc('\n', stdout);

    71       mp_sub(&c, &d, &d);

    72       printf("dif "); mp_print(&d, stdout); fputc('\n', stdout);

    73       mp_clear(&c); mp_clear(&d);

    74       mp_clear(&a);

    75       return 1;

    76     }

    77   }

    78   printf("Accuracy is confirmed for the %d test samples\n", num);

    79   mp_clear(&d);

    81   printf("Testing squaring ... \n");

    82   srand((unsigned int)seed);

    83   start = clock();

    84   for(ix = 0; ix < num; ix++) {

    85     mpp_random_size(&a, prec);

    86     mp_sqr(&a, &c);

    87   }

    88   finish = clock();

    90   d2 = (double)(finish - start) / CLOCKS_PER_SEC;

    92   printf("Testing multiplication ... \n");

    93   srand((unsigned int)seed);

    94   start = clock();

    95   for(ix = 0; ix < num; ix++) {

    96     mpp_random(&a);

    97     mp_mul(&a, &a, &c);

    98   }

    99   finish = clock();

   101   d1 = (double)(finish - start) / CLOCKS_PER_SEC;

   103   printf("Multiplication time: %.3f sec (%.3f each)\n", d1, d1 / num);

   104   printf("Squaring time:       %.3f sec (%.3f each)\n", d2, d2 / num);

   105   printf("Improvement:         %.2f%%\n", (1.0 - (d2 / d1)) * 100.0);

   107   mp_clear(&c);

   108   mp_clear(&a);

   110   return 0;

   111 }

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